Identification of children at very low risk of clinically-important brain injuries after head trauma: a prospective cohort study - Kuppermann, N; Holmes, JF; Dayan, PS; Hoyle, JD, Jr; Atabaki, JR; Holubkov, R; Nadel, FM; Monroe, D; Stanley, RM; Borgialli, DA; Badawy, MK; Schunk, JE; Quayle, KS; Mahajan, P; Lichenstein, R; Lillis, KA; Tunik, MG; Jacobs, ES; Callahan, JM; Gorelick, MH; Glass, TF; Lee, LK; Bachman, MC; Cooper, A; Powell, EC; Gerardi, MJ; Melville, KA; Muizelaar, JP; Wisner, DH; Zuspan, SJ; Dean, JM; Wootton-Gorges, SL (Lancet, 2009)